I finally got it working 
Thank you guy's soo much for your help!
In the end there where 2 quite obvious flaw's in my code, which i failed to realize or see...
Nr. 1: I had commented out the function initializing the PPM signal "setupPPM()" in my "void setup(void)"
Nr 2: I failed to include the entire part of the code driving the PPM signal in my "void loop(void)"
In essence i have been sloppy in my effort to edit or re-write some of the code.
I apologize for wasting the time of the user's who took their time to look at my code/problem.
The fault's in the code should have been obvious even to an un-experienced/new coder like myself.
But thank you anyway's for helping me realize.
I had been trying for about a week to wrap my head around these concepts and protocols.
By now I've started to understand some parts of it and have a slight overview of how these things work, from the I2C protocol and that pull-up og pull-down resistors are a thing and amongst other tings define's the address given to devices on you I2C buss. A fair deal of looking into what PPM is and how it works. So now i got the principles down and have some idea of how it work's.